+/**
+ * GRE Header
+ */
+struct gre_hdr {
+#if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
+ uint16_t res2:4; /**< Reserved */
+ uint16_t s:1; /**< Sequence Number Present bit */
+ uint16_t k:1; /**< Key Present bit */
+ uint16_t res1:1; /**< Reserved */
+ uint16_t c:1; /**< Checksum Present bit */
+ uint16_t ver:3; /**< Version Number */
+ uint16_t res3:5; /**< Reserved */
+#elif RTE_BYTE_ORDER == RTE_BIG_ENDIAN
+ uint16_t c:1; /**< Checksum Present bit */
+ uint16_t res1:1; /**< Reserved */
+ uint16_t k:1; /**< Key Present bit */
+ uint16_t s:1; /**< Sequence Number Present bit */
+ uint16_t res2:4; /**< Reserved */
+ uint16_t res3:5; /**< Reserved */
+ uint16_t ver:3; /**< Version Number */
+#endif
+ uint16_t proto; /**< Protocol Type */
+} __attribute__((__packed__));